Tissue or cell respiration is a combination of processes using air in the cells of organs and tissues, which result in the oxidation of the breakdown of carbohydrates, fats and proteins...

Displays nervous system coordination which provides stability of the physical and psychological activity of a body...

The pillar of good health, the most basic system of the entire organism is the gastrointestinal system of human being, and this is due to the fact that this system is related to the absorption of nutrients from the foods...

The lymphatic system guards the purity of the body around the clock. It plays an important role in the removal of metabolic products, as well as in maintaining immunity...